Copolymers containing hydroxyl and carboxyl groups by reacting glycidyl esters and carboxyl monomers
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United States of America Patent
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Sep 2, 1997
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N/A
app pub date -
Apr 19, 1995
filing date -
May 2, 1994
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Abstract
Low-viscosity copolymers useful in coating compositions, containing hydroxyl and carboxyl groups are obtained by free-radical polymerization of A) from 3 to 50% by weight of one or more glycidyl esters of aliphatic saturated monocarboxylic acids having a tertiary or quaternary .alpha. carbon atom, and B) from 97 to 50% by weight of at least two olefinically unsaturated copolymerizable monomers of which at least one contains at least one COOH group and at least one is sterically hindered, the quantity of COOH groups in component B exceeding the quantity of epoxy groups in component A to such an extent that the resulting copolymer has an acid number of at least 15 mg of KOH/g.
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